218805144 has 16 divisors (see below), whose sum is σ = 547012920. Its totient is φ = 72935040.

The previous prime is 218805143. The next prime is 218805229. The reversal of 218805144 is 441508812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218805143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4558417 + ... + 4558464.

Almost surely, 2^218805144 is an apocalyptic number.

218805144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

218805144 is an abundant number, since it is smaller than the sum of its proper divisors (328207776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218805144 is a wasteful number, since it uses less digits than its factorization.

218805144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9116890 (or 9116886 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 33.

The square root of 218805144 is about 14792.0635477272. The cubic root of 218805144 is about 602.5861922224.

The spelling of 218805144 in words is "two hundred eighteen million, eight hundred five thousand, one hundred forty-four".